自旋转移系统中由排斥作用引起的有效吸引
Effective attraction induced by repulsive interaction in a spin-transfer system
摘要：
在易面各向异性占主导地位的磁系统中，磁化强度可以通过有效的一维面内角方程来描述。重新推导这个方程中存在的自旋转移力矩，我们得到一个描述，允许一个更直观的理解自旋电子器件的操作，可以作为一种工具，寻找新的动态制度。一个令人惊讶的预测是获得平面的“自旋翻转晶体管”：一个不稳定的平衡点可以稳定的电流感应扭矩，进一步排斥系统从该点。由于耗散环境的存在而发生排斥稳定，并且需要足够大的吉尔伯特阻尼常数以确保零电流下的过阻尼动态。
英文摘要：
In magnetic systems with dominating easy-plane anisotropy the magnetization can be described by an effective one dimensional equation for the in-plane angle. Re-deriving this equation in the presence of spin-transfer torques, we obtain a description that allows for a more intuitive understanding of spintronic devices' operation and can serve as a tool for finding new dynamic regimes. A surprising prediction is obtained for a planar ``spin-flip transistor'': an unstable equilibrium point can be stabilized by a current induced torque that further repels the system from that point. Stabilization by repulsion happens due to the presence of dissipative environment and requires a Gilbert damping constant that is large enough to ensure overdamped dynamics at zero current.
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